Bug ID 523451: Benign virtio I/O errors when run on pre 11.5 hosts

Last Modified: Oct 06, 2020

Bug Tracker

Affected Product:  See more info
BIG-IP vCMP(all modules)

Known Affected Versions:
12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4

Opened: May 14, 2015
Severity: 5-Cosmetic


When running version 12.0.0 on vCMP host versions previous to 11.5.0, the system produces a series of benign errors in /var/run/vcmpd/guestname/qemu.pid similar to the following messages: block I/O error in device 'virtio0': Input/output error (5).


Cosmetic: a small number of benign virtio0: Input/output errors appear in the guest's logs on the host. These errors are cosmetic and are a known and benign issue related to the version of qemu and how it handles newer linux kernels.


Running BIG-IP software version 12.0.0 configured for vCMP on hosts with versions earlier than 11.5.0.


None needed. These are cosmetic errors that have no impact on system functionality.

Fix Information


Behavior Change